Drop collision with a hot, dry solid substrate: Heat transfer during nucleate boiling

Breitenbach, Jan; Roisman, Ilia V.; Tropea, Cameron

doi:10.1103/physrevfluids.2.074301

Cited by 50 publications

(36 citation statements)

References 50 publications

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“…3. Note that these droplets are ejected due to the rupture of nucleation bubbles, as is typical of the nucleate boiling regime identified for pure liquids [57]. Several time instants are shown for each sequence, beginning as the liquid film spreads and recoils.…”

Section: Effect Of Ambient Pressure On a Multicomponent Fuel: Gasolinementioning

confidence: 93%

Multi-component fuel drop-wall interactions at high ambient pressures

Chausalkar

Kweon

Michael

2021

Fuel

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In direct injection engines, multicomponent fuels are injected at high pressures-resulting in a finely atomized spray which impacts on the hot wall of the piston crown and cylinder liner. The variable operating load of typical combustors results in widely varying wall temperature and ambient pressures. For quantitative prediction of the combustion spray physics, detailed data is required for the impact of multicomponent fuel drops on these heated surfaces at combustor-relevant pressures. A series of experiments are presented for blends of n-heptane and n-decane, as well as a commercial gasoline blend impacting heated walls at ambient pressures in the range of 1-20 bar and wall temperatures up to 350 °C. Time-resolved image sequences for single drop impacts are used to classify the onset of Leidenfrost phenomena, nucleate boiling, and film spreading. Results are summarized by impact regime diagrams, and bi-component mixtures are found to replicate the systematic behavior observed for a gasoline drop with the higher volatility components controlling behavior at low pressure, and a decreasing effect at high pressure. These experiments establish a baseline for multicomponent drop-wall interactions at combustor-relevant pressure, and will aid in development of simulations incorporating relevant spray-wall physics in combustors.

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Section: Effect Of Ambient Pressure On a Multicomponent Fuel: Gasolinementioning

confidence: 93%

Multi-component fuel drop-wall interactions at high ambient pressures

Chausalkar

Kweon

Michael

2021

Fuel

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“…To achieve an estimate of the total evaporation time of the deposited drop in the nucleate boiling regime, a heat balance model from [16,17] is needed. The target is assumed to be a semiinfinite wall, where x is the longitudinal wall coordinate, with its origin at the upper surface of the substrate.…”

Section: Mathematical Model For Residence Time In the Nucleate Boiling Regimementioning

confidence: 99%

Influence of lubricant addition on dynamics of a single drop impacting onto a very hot substrate

Joksimovic

Schmidt

Roisman

et al. 2021

ICLASS

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In the present experimental study the effect of graphite lubricant additives on the dynamics of a single drop impact onto a very hot surface, accompanied by intensive nucleate or film boiling and thermal atomization, has been investigated. The impact has been observed using a highspeed video system. The observations allow to identify the impact regime and to measure the drop residence time from collision to complete rebound, disintegration or evaporation, depending on the thermodynamic regime of the event. The residence time of the drop is measured as a function of lubricant concentration and of the initial temperature of the heated surface. The measurement results are compared to existing experimental data obtained for pure water drops. Additionally, an existing mathematical model developed for pure water impact was re-calibrated for various lubricant mixtures.

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“…Above saturation temperature, nucleate boiling can be observed. The heat flux in the nucleate boiling regime is described in [11] and shown in Fig. 5 by the resulting residence time .…”

Section: Investigations Of Multi-componentmentioning

confidence: 99%

Selected Results of the Collaborative Research Center “Droplet Dynamics under Extreme Ambient Conditions” SFB-TRR 75

Schulte

Tropea

2021

ICLASS

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A fundamental understanding of droplet dynamics is important for the prediction and optimization of technical systems involving drops and sprays. The Collaborative Research Center (CRC) SFB-TRR 75 was established in January 2010 to focus on the dynamics of basic drop processes, and in particular on processes involving extreme boundary conditions, for example near thermodynamic critical conditions, at very low temperatures, under strong electric fields or in situations involving extreme gradients in the boundary conditions. The goal is to gain a profound physical understanding of the essential processes, which is the basis for new analytical and numerical descriptions and for improved predictive capabilities. This joint initiative involves scientists at the University of Stuttgart, the TU Darmstadt, the TU Berlin, and the German Aerospace Center (DLR) in Lampoldshausen within 18 projects. The present contribution provides a brief overview of the structure of this CRC, of projects being carried out at the SFB-TRR 75 and some scientific highlights of selected projects. The main purpose of this article is to familiarize colleagues with this extensive and dedicated research effort in this area of drop dynamics and to motivate further collaboration with others in this field.

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Drop collision with a hot, dry solid substrate: Heat transfer during nucleate boiling

Cited by 50 publications

References 50 publications

Multi-component fuel drop-wall interactions at high ambient pressures

Multi-component fuel drop-wall interactions at high ambient pressures

Influence of lubricant addition on dynamics of a single drop impacting onto a very hot substrate

Selected Results of the Collaborative Research Center “Droplet Dynamics under Extreme Ambient Conditions” SFB-TRR 75

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